That isn't exactly how things played out, as the wide receiver didn't see a lot of playing time and expressed frustration at not playing enough on social media.
He said this offseason was different from him and things have changed.
"I feel more comfortable now," Arnett said. "I'm relaxed. My mind was running last year, I can definitely say that my mind was running last year. I was just trying to do as much as possible last year. I just had to slow down.
"This year, I did and I feel more comfortable with everything. Everything makes sense now."
Spartans wide receiver coach Terry Samuel said Arnett was just needing to get his feet under his last year, and now is ready to make an impact.
"He was trying to figure it all out last year and now I think he has a really good feel for what he can do and what he can bring to the table," Samuel said. "Now, I think we should see him doing those things a lot more in a game. We are expecting him to make plays in a game.
"He has just got to make sure he is where the quarterback wants him to be, so when he is there in a consistent fashion, good things are going to happen for him."
Now that Arnett has slowed down and learned how to use his speed, Samuel said there are reasons to expect big things from him.
"The fact that he is quick as all get out and now that he knows what to do," Samuel said. "There were times where I said DeAnthony has so much speed, he is just so quick, you're teaching a different type of wideout. He has started to understand within our offense what he can do with his skill set."
Arnett said the relationship with Samuel had its rises and falls, but he appreciated working with him.
"It's been great," Arnett said. "Last year, we kind of had our ups and downs. It's been great. As a whole, it has been great. We have just been able to communicate more and talk more.
"I can go to him and he can help me with anything that I need or if I did something wrong on a play, he is always right there to correct me and to help me. He has been a great mentor to me."